Model 95 multi-section caps
Posts: 4
Threads: 1
Joined: Nov 2018
City: Sultan
State, Province, Country: Wa
Hello ! Would anyone know if the 2 mfd caps within the multi-section "B" block are polarized or non-polar ? Could I sub a polarized electrolytic ?
Also- is it normal for all these old tubular caps to appear to increase their value dramatically ? I'm seeing .015's that read like .06 mfd . makes me think I have the wrong info, but no....
Posts: 5,084
Threads: 270
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Welcome to the Phorum!
I moved your thread into the Electronic restoration section.
Posts: 15,811
Threads: 553
Joined: Oct 2011
City: Jackson, NJ
Thry are non-polarized.
It is typical for them to increase in value when aged. Yes 0.015 uF will easily become a few times that.
Electrolytic are fine.
Better yet, use modern film caps like Solen, they will last forever whereas lytics are inherently limited life parts.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
(This post was last modified: 11-30-2018, 10:32 PM by morzh.)
Posts: 7,286
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
Hi and welcome,
As Mike mentioned the better choice is to use film caps for the power supply filters. I serviced a Philco 87 which has a similar style power supply and use several pair of 4.7mf @450v electrolytics in series to equal abt 2.3mfd. All went well but after abt 6 months of uses the input filter shorted and nearly took out the 80 rectifier tube. Wouldn't use ecaps in these late '20 and early '30s sets.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 15,811
Threads: 553
Joined: Oct 2011
City: Jackson, NJ
Well,
To exonerate the electrolytics a bit I need to state that most times a lytic cap from a reputable mfr, properly sized WV and ripple current-wise (the latter is mportant) will do just fine and will die slowly as most lytics do over a period of many years.
This said, if fit size-wise, the film caps will last forever. In terms of human lifespan.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 4
Threads: 1
Joined: Nov 2018
City: Sultan
State, Province, Country: Wa
Thank you all ! Are the films non-polar? I'm not familiar with these- does anyone know a good source for small quantities? i often buy from Antique Electronic Supply(Tubes and More) I'll try to look them up. This old 95 highboy is really quite well preserved; it definitely needs to work well. Cabinet and pictorial grill cloth are excellent.
Posts: 7,286
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
I mostly get caps from Sal's http://www.tuberadios.com/capacitors/ Prices are good and you can get singles although I usually buy in quantity as I'm always am working on something.
Yes film cap are non polarized (no + or -). You can parallel up several to get the specified value.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 4,703
Threads: 51
Joined: Sep 2008
City: Sandwick, BC, CA
The model 95 is a 1929 model, so no electrolytics were used, though the wet Mershon electrolytics were available at the time I think. A.E.S carries the Solen brand film caps, which have a good reputation, I think that they are also offered in values up to 15 uf but don't quote me on that. For the 2 uf sizes you can probably use those yellow 630 Vdc caps with no issue.
Regards
Arran
(This post was last modified: 12-07-2018, 12:41 AM by Arran.)
Posts: 4
Threads: 1
Joined: Nov 2018
City: Sultan
State, Province, Country: Wa
Thanks!! That really helps.
Posts: 4
Threads: 1
Joined: Nov 2018
City: Sultan
State, Province, Country: Wa
Thank you !! really helpful !
Posts: 813
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
I am curious, with all the discussion about ripple current and electrolytics, how does one determine how much ripple current there is in a power supply? In other words, how do you determine when a cap has sufficient capability to work in a particular application? I know you can use Solens or metal film caps and be good.
Ron
Bendix 0626. RCA 8BX5. RCA T64
Philco 41-250. Philco49-500
GE 201. Philco 39-25
Motorola 61X13. Philco 46-42 Crosley 52TQ
Philco 37-116. Philco 70
AK 35 Philco 46-350
Philco 620B. Zenith Transoceanic B-600
Philco 60B. Majestic 50
Philco 52-944. AK 84
Posts: 15,811
Threads: 553
Joined: Oct 2011
City: Jackson, NJ
The rule of a thumb often is to make the ripple rating equal twice the load current. That only goes for the very first cap (paralleling the rectifier tube). He rest do not see as much ripple.
So if the rectifier supplies the radio with 50mA of current, the 100mA rating is enough.
I use higher rating so I do not have to think about it. I buy Panasonic caps that are about 600mA rated and this is good for just about any rectifier, even in the Eico stereo amp.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
(This post was last modified: 12-09-2018, 12:18 PM by morzh.)
Posts: 27
Threads: 1
Joined: Aug 2018
City: Mississauga
State, Province, Country: Ontario
I have a box of capacitors from:
https://justradios.com/
Prices are reasonable because he is a Canadian supplier in the Scarborough (east) side of Toronto. Dave Cantelon is a member of the London Vintage Radio Club, which is where I met him. One of the good guys and he has X1 and Y2 capacitors for AC line input use.
Posts: 813
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
Thanks Mike, that makes it easy enough!
Ron
Bendix 0626. RCA 8BX5. RCA T64
Philco 41-250. Philco49-500
GE 201. Philco 39-25
Motorola 61X13. Philco 46-42 Crosley 52TQ
Philco 37-116. Philco 70
AK 35 Philco 46-350
Philco 620B. Zenith Transoceanic B-600
Philco 60B. Majestic 50
Philco 52-944. AK 84
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
HiFi (Chifi) tube amp build - but my own design.
|
| Tim,
nice write up and thanks for sharing !!
Sincerely Richardradiorich — 02:47 AM |
|
HiFi (Chifi) tube amp build - but my own design.
|
| Well, this was a real "Hum-Dinger" :lol: ! This will be kinda long, but hopefully it will help others having t...TV MAN — 01:55 AM |
|
Shadow Meter Bulb
|
| Phorum members, I am trying to find the bulb # for PHILCO Shadow Meter part number 45-2180 that is from a 37-640 chassis...georgetownjohn — 06:53 PM |
|
Philco 41-608 changer coupler
|
| 3D-printing...short of machining, of course.
Or molding.morzh — 05:20 PM |
|
Philco 41-608 changer coupler
|
| Thanks, Morzh.
That solves the issue of the rubber pieces. Now, I need to find a way to replicate the pot metal piec...alangard — 05:07 PM |
|
12' Philco
|
| If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel.
Kareem would have an e...morzh — 01:48 PM |
|
12' Philco
|
| And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM |
|
Hickok AC51 tube tester
|
| I think they have only shown the secondaries of the transformer.
Two of them feed the rectifiers' filaments.morzh — 12:58 PM |
|
IF can wire size and Rubber mounts?
|
| Arran
If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM |
|
12' Philco
|
| Rod,
Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently.
H...morzh — 12:54 PM |
|
Who's Online
|
There are currently 6948 online users. [Complete List]
» 2 Member(s) | 6946 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
